Connect to dial-up connections

I am evaluating Windows XP remote connection software for connecting to
remote machines (hosts) which connect to the internet with a analog modem
from jobsites, or a low speed IDSL. All machines running windows xp pro
sp1a. The client machine is on a LAN subnet of a WAN connected to the
internet via a T1 with a Windows 2000 server domain. I went through the
Getting Started walk through on Microsoft's site at the following link:

http://www.microsoft.com/windowsxp/...emotedesktop/de
fault.asp

And I having no luck. Can I use the remote desktop connection this way? If
so, What should I check or what might I be doing wrong? Any help is
appreciated.